Indigenous Languages Development Act Article 15

Public transportation, stations andcompetent authority of relevant agenciesin indigenous regions shall increase thebroadcast of regional languages.Public transportation, stations andcompetent authority of relevant agenciesin non-indigenous regions shall proceedwith the preceding item according to thecharacteristics and needs of localindigenous peoples.
中文原文 原住民族語言發展法第15條
原住民族地區之大眾運輸工具及場站,目的事業主管機關應增加地方通行語之播音。
非原住民族地區之大眾運輸工具及場站,目的事業主管機關得視當地原住民族特性與需要,辦理前項事項。

English translation for reference only; the Chinese text prevails. Not legal advice.